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Income Taxes - Reconciliation of Expected Income Tax Expense (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Comparison of income tax expense (benefit) and tax computed at the statutory rate |  |  |
Income taxes at federal statutory rate | $ 1,326.1 | $ 1,602.2 | $ 1,124.8
Increase (decrease) in tax resulting from: |  |  |
State income taxes, net of federal benefit | 208.1 | 210.0 | 166.9
Valuation allowance | (3.1) | (2.1) | (3.3)
Tax credits | (44.4) | (100.8) | (116.3)
Excess tax benefit from equity compensation | (25.6) | (20.1) | (38.4)
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount | (1.5) | 0.0 | (6.0)
Other | 59.9 | 44.9 | 37.4
Total income tax expense (benefit) | $ 1,519.5 | $ 1,734.1 | $ 1,165.1

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